Cross Lake Project (1983-86)

Geologist    P.G. Lenton     Year    83     STATION    5007
EASTING   568428     NORTHING   6044763     ZONE   14     DATUM   NAD83
Date of mapping    06/18/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 62 68
fault 51 82

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
gneissic
leucocratic

Field Description:

-Situation very similar to 5006 - old gneissic, cataclastic leuco-TNLT with agmatized and boudinaged blocks of less deformed charcoal grey granodiorite
-35 cm pegmatite with biotite, potassium feldspar and 5 mm magnetite crystals

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral biotite 0.0 0.0 6.0 mm

Minerals of Note
Mineral Abundance (%)
potassium feldspar

Rock Number: 2

Rock Type: granodiorite
Descriptors:
massive
hornblende - biotite bearing

Field Description:

-same as 5006 except plagioclase phenocrysts are absent
-makes up around 10% of exposure
-relationship not as obvious but still looks intrusive into pre-existing gneiss

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral 0.0 0.0 15.0 mm
groundmass grainsize 0.0 0.5 mm

Manitoba Geological Survey, 2017